1又3分之1÷(-5)+(-0.2)*(-6分之5) 2. (2分之1-2)÷(-3)+(4分之1-8分之3)*5分之8 3. 2分之1÷(-4分之1)+【1-5分之3*(-5)】÷(-4)4. (2-3分之1)*(-6)-(1+2分之1)÷(
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![1又3分之1÷(-5)+(-0.2)*(-6分之5) 2. (2分之1-2)÷(-3)+(4分之1-8分之3)*5分之8 3. 2分之1÷(-4分之1)+【1-5分之3*(-5)】÷(-4)4. (2-3分之1)*(-6)-(1+2分之1)÷(](/uploads/image/z/2715148-28-8.jpg?t=1%E5%8F%883%E5%88%86%E4%B9%8B1%C3%B7%EF%BC%88-5%EF%BC%89%2B%EF%BC%88-0.2%EF%BC%89%2A%EF%BC%88-6%E5%88%86%E4%B9%8B5%EF%BC%89+++++2.+++%EF%BC%882%E5%88%86%E4%B9%8B1-2%EF%BC%89%C3%B7%EF%BC%88-3%EF%BC%89%2B%EF%BC%884%E5%88%86%E4%B9%8B1-8%E5%88%86%E4%B9%8B3%EF%BC%89%2A5%E5%88%86%E4%B9%8B8+++3.++++++2%E5%88%86%E4%B9%8B1%C3%B7%EF%BC%88-4%E5%88%86%E4%B9%8B1%EF%BC%89%2B%E3%80%901-5%E5%88%86%E4%B9%8B3%2A%EF%BC%88-5%EF%BC%89%E3%80%91%C3%B7%EF%BC%88-4%EF%BC%894.+++++++%EF%BC%882-3%E5%88%86%E4%B9%8B1%EF%BC%89%2A%EF%BC%88-6%EF%BC%89-%EF%BC%881%2B2%E5%88%86%E4%B9%8B1%EF%BC%89%C3%B7%EF%BC%88)
1又3分之1÷(-5)+(-0.2)*(-6分之5) 2. (2分之1-2)÷(-3)+(4分之1-8分之3)*5分之8 3. 2分之1÷(-4分之1)+【1-5分之3*(-5)】÷(-4)4. (2-3分之1)*(-6)-(1+2分之1)÷(
1又3分之1÷(-5)+(-0.2)*(-6分之5) 2. (2分之1-2)÷(-3)+(4分之1-8分之3)*5分之8
3. 2分之1÷(-4分之1)+【1-5分之3*(-5)】÷(-4)
4. (2-3分之1)*(-6)-(1+2分之1)÷(-3)
5. (-0.25+4分之3)÷【2分之1+(-4分之3)*(3分之5-3)】
1又3分之1÷(-5)+(-0.2)*(-6分之5) 2. (2分之1-2)÷(-3)+(4分之1-8分之3)*5分之8 3. 2分之1÷(-4分之1)+【1-5分之3*(-5)】÷(-4)4. (2-3分之1)*(-6)-(1+2分之1)÷(
1、1又3分之1÷(-5)+(-0.2)*(-6分之5)
=4/3÷(-5) + (-0.2)×(-5/6) =4/3 × (-1/5) + (-1/5) × (-5/6) = (-1/5) × (4/3-5/6) = (-1/5)×(1/2) = -1/10
2、(2分之1-2)÷(-3)+(4分之1-8分之3)*5分之8
=(1/2-2) × (-1/3) + (1/4-3/8) × 8/5 = (-3/2)×(-1/3)+(-1/8)×(8/5)=(1/2)-(1/5)=3/10
3、2分之1÷(-4分之1)+【1-5分之3*(-5)】÷(-4)
=(1/2)×(-1/4)+[1-(3/5)×(-5)]÷4=(-1/8)+[1-(-3)]÷4=(-1/8)+1=7/8
4、(2-3分之1)*(-6)-(1+2分之1)÷(-3)
=(2-1/3)×(-6)-(1+1/2)÷(-3)=(5/3)×(-6)-(3/2)×(-1/3)=-10+1/2=21/2
5、(-0.25+4分之3)÷【2分之1+(-4分之3)*(3分之5-3)】
=[(-1/4)+(3/4)]÷[1/2 + (-3/4)×(5/3-3)]=(1/2)÷[1/2+(-3/4)×(-4/3)]=(1/2)÷(1/2+1)=(1/2)÷(3/2)=1/3
楼主要熟记运算法则
1,=4/3X1/5-1/5x5/6=(4/3-5/6)x1/5=1/10(十分之一)
2,=(-3/2)x(-1/3)+(-1/8)x8/5=1/2-1/5=3/10
3,= 1/2x4+(1+3)/4=2+1=3
4,=(-5/3)x(-6)+3/2x1/3=10+1/2=10.5
5,=(-1/4+3/4)÷(1/2-3/4x2/3)=1/2÷(1/2-1/2)=0
这东西,好意思提问